the spark plugs were filled with oil

This happens when the valve cover gasket needs to be replaced. This video shows the job being done on a similar car but the process is the same:

https://youtu.be/RjnW9C7RFdc

Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/replace-valve-cover-gasket

Let us know what happens and please upload pictures or videos of the problem.